Windows/Linux: Open-source image editor MyPaint allows you to draw and edit images in fullscreen mode, on a limitless canvas that grows with your image and eliminates pesky scroll bars. It also works with pressure-sensitive tablets and touch screens for the creative set.

MyPaint includes a wide array of extensively customizable brushes. There's also basic layer support, color history, and a color palette that includes complimentary colors. Unfortunately, copying and pasting your work directly into external image editing programs isn't supported, but you can save your images in common formats like PNG to import them into other image editors.

It won't replace Photoshop if you need a feature-rich program but, being essentially a simplified Corel Painter, it offers an intuitive painting space. MyPaint is open-source freeware for Windows and Linux systems only.